Guy, two comments:
1) First is look at the top right of your Phase sky in the second series -- you have magenta which is possibly from no LCC? I stand by what I've said before, folks really need an LCC on P65+/IQ160 up with tech cam capture for most accurate color.
2) I agree that NX color is significantly better than ACR for the Nikon file, but I am still seeing way better greens (both broader range and ore real) and richer reds in the tech/phase files. But I do like what the D800 delivers net/net/net for a 35 DSLR!
Edit to third comment: Skins look pretty good in the above! NX may need a couple of points of sat boost...